Sharelink improvements, imagediff fix, original timestamp and cursor

* Made the cointainer of the "Share Link" a `p`-Element, because it is much easier to size it.
(The sizing is currently broken in firefox)
* Fixed the imagediff to work correctly with the first image.
* Timestamp shows now the "raw" timestamp in the `title`. 
* `more info`-Link now also has a "click-me"-cursor.